Method of treating cellulosic material



Patented Feb. 18, 1941, I v

UNITED STATES PATENT OFFICE K Christopher Luckhaupt, Jamaica; N. Y. i

No Drawing. Application March 28, 1938, Serial No.,198,603

3 claims. (01. 18-55) This invention relates to a method of treatingFurther features and objects of the invention cellulosic material. willbe more fully understood from the following More particularly theinvention relates to the detail description, treatment of cellulosicmaterials, such as pulp, Preferably my invention contemplates the ad- 5sulfite', "soda, kra'ft, wood or other cellulosic dition to pulp,sulfite, soda, krait and wood or 5 powder, pulp or fibrous matter.Examples of other cellulose pulp or fibrous matter of similar suchmaterials include wood flour, newsprint, material which is insoluble inthe treatment mapaper pulp,

terial at or above 115' C., of terpi'n hydrate This application is acontinuation in part alone, in powdered form or terpin hydrate adl0 of apart, of my cQ-pending application Serial mixed with desirable fillersor fortifiers such as 0 No. 75,929, filed April 23, 1936, entitledProcess eates, Stearates, waxes, and gums, oils, both of hardeningcellulose matter and resulting mineral and vegetable and which will havethe products now U. S. Patent No. 2,112,245, dated effect o impartingdesirable characteristics to March 29, 1938, and a continuation in partof e material being treated, or which will enmy copending application,Serial No. 113,463, hence characteristics already present in the ma- 15filed November 30, 1936, entitled Method of alv treating porousmaterials and resulting prod- Where O are in liquid o t e S me ucts, nowU. S. Patent No. 2,173,882, patented y be sprayed upon the materialbeing treated September 26, 1939. v or the material may be immersed in avolume of An object of this invention is the treatment the fortifiers ad a terwards removed there- 20 of cellulosic materials in thesubstantially raw and excess i fi expressed therefrom or unprocessedstage to impart thereto enhanced by pressure gravity. The material beinghardness and enhanced correlated attribut t eated is ordinarily infinely divided form, such viz increased tensile strength, increasedflexural 9 example as so-called fl fi e y strength, increasedcompressional strength, oildlvided P g u -11D pulp or in the case, 25and water-proofness, fireprooiness and the like. examplep t. thematerial is An object of the invention is theproductlon the Original 'frm to be afterwards comof processed'material adapted to be utilized inmmuted Prior to S sequent molding processes. the production of articlesby molding processes, The fortifiers. ch as have been designated suchas-suction molding, pressure molding, and above, y be Used S ult neouslywith or sub-' 30 the like, usually with the aid oi superheatedsequent'to the pin hydr te, and in any event steam t v the fortifierswhen employed are used in a quan- An' object of the invention is theproduction titrerelative to e quan y o terr hydrate of cellulosicmaterial resistant to weather dein the ratio of su stant ally 2% to 50%of the terioration, including resistance to the effects of quantity ferpin hydrate used.- Further, a the sun, and like exposure. plurality offortiflers may be used, and in such Another object of the invention isthe proevent, the amount of for ifiers used ranges from duction ofcellulosic material embodying one 2%410 of the quantity of terpinhydrate. or more of the above stated improved qualities The proportionof treatment m te el re at ve 40 and/or with variant coloring effect. tothe treated material is varied as desired, as 40 My invention comprises,in general, the treati understood by those skilled in the art, ement ofporous matter of cellulosic character p di upon the degree ofimpregnation by which is insoluble in warm terpln hydrate by thetreatment materi l or the treated material. subjecting the same insuitable relation with the degree of the enhanced attributes of thereterpin hydrate, as by immersion in a suitable suiting trea ed materielVa y w iZ'he p 45 bath of the stated treatment material, or by portionor the treatment material relative to the subjecting such matter to aspray r such treatt eated ma rial. t e t me t e p ratur ment material,or by subjecting such matter to above and t d r ion of the trea thevapor arising from the hot treatment mament period.

terial. The aforesaid cellulosic materials as ape The material treatedaccording to my pres- 50 pears from my aforesaid U. S. Patent No. entinvention remains in powdered or com- 2,173,882, patented September 26,1939, are inminuted condition or may be powdered or comsoluble in theterpin hydrate treatment material minuted after the process iscomplete.

at treatment temperature, to wit, at or above Such treated material maybe subjected to a 5 115 C. 1 molding process, such as suction molding orpressure molding with or without excess water,"

the molding process, is then removed and allowed to dry, and upon dryingattains the stage of substantial adhesion of the fibers, and theresulting article has all of the attributes of en hanced hardness,flexibility, immunity from action by water, oils, etc.

Color as desired may be imparted to the material and to the productresultingtherefrom, by adding suitable coloring niatter, such as anilin,vegetable, mineral and other dyes, pigments, etc., simultaneously withthe addition to the product of terpin hydrate.

Whereas I have described my invention by rei- -erence to specific formsthereof, it will be understood that many changes and modifications maybe made without departing from the spirit of the invention.

I claim: a p

1. The method of imparting enhanced hardness to cellulosic material,selected from pulp, sulfite, soda, kraft, and wood in comminuted formwhich is insoluble in terpin hydrate treatment material ,at treatmenttemperature ,of 115 C. and upward, which comprises admixing suchcomminuted material with terpin hydrate in powdered form, and thensubjecting the cellulosic material to treatment temperature of 115 C.and upward and pressure-in the presence ofwater.

2. The method oi producing a m'oldedprodnot of cellulosic materialselected from the group consisting of sulflte, soda and kraft pulp andcomminuted wood, said cellulosic material being insoluble in terpinhydrate at or above its melting point of approximately 115 C., whichcomprises treating said cellulosic material with terpin hydrate at orabove 115 C. and subjecting the resulting treated material to heat ofthe order of 115 C. and pressure in a suitable mold.

3. The method of producing a molded product of cellulosic materialselected from the group consisting of sulflte, soda and kraft pulp andcomminuted wood, said cellulosic material being insoluble in terpinhydrate and a fortifler selected from the group consisting of oleates,stearates, waxes, and gums, oils, both mineral and vegetable, at orabove the melting point of the terpin hydrate of approximately 115 C.,which comprises treating said cellulosic material with terpin hydrateadmixed with such fortifier in the proportion of from 2% to 50% of suchfortifler to terpin hydrate at or above 115 C. and subjecting theresulting treated material to heat of the order ,of 115 C. and pressurein a suitable mold.

CHRIS'IiQPI-IER LUCKHAUPT.

